FINAL BOARD (X56-1200-001VOX-VR BOARD (X54-1190-00)
Three variable resistors. VOX GAIN. ANTI VOX and DELAY,
are directly mounted on a printed circuit board.
This unit includes all the circuits of the power amplifier of
the final stage with the exception of the pi-network circuit at
the output side.
5V AVR BOARD (OPTION) (X43-1220-00)
This is a 5V power stabilizer used for the counter unit. It
uses IC to provide rated voltage without making any adjust-
ments.
MARKER BOARD (X62-0005--01)
The MARKER board holds the 100 kHz crystal oscillator
(Q 1) and a 25 kHz multivibrator (Q2 and Q3) to produce
marker signals at 25 kHz intervals to calibrate the TS-820.
Q4 amplifies the calibrator signal
RECTIFIER BOARD (X43-1090-02)
This board holds all of the diode rectifiers for the power sup-
ply section of the transceiver. D 1 through D4 rectify the
high voltage. D5 rectifies the 300 volt supply. D6 rectifies
the 210 volt supply. D7 rectifies the 90 volt supply. and D8
through D 11 rectify the 138 VDC supply.
Fig. 22 FINAL Board
5.3 FINAL STAGE POWER AMPLIFIER
This amplifier delivers 200W PEP input by 2 transmit power
tubes (S2001A). It is equipped with a cooling fan to avoid
temperature rise during operation
HV (HIGH VOLTA
(X43-1110-001
This voltage divider
signal for the HV
screen source used
INDICATOR BOARD (X54-11BO-OOI
This circuit controls the light emitting diodes which indicate
when the AIT circuit is on. when the fixed frequency oscilla-
tor is operating. or when the VFO is oscillating.
RELAY BOARD (X43.1190.00)
This unit holds the stand-by relay. a 5V power stabilizer to
feed power to the PLL circuit. and smoothing capacitors to
obtain low voltage DC power.
The relay of this unit is used to select DC signal for con-
trolling block bias. cross channel operation. etc.
~
32
GEl
BOARD
circuit supplies a himeter
readmg and
in the TUN mode
gh voltage metering
also a low voltage
of operation
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